US7463746B2 - Narrow opening electroacoustical transducing - Google Patents

Narrow opening electroacoustical transducing Download PDF

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Publication number
US7463746B2
US7463746B2 US10/403,407 US40340703A US7463746B2 US 7463746 B2 US7463746 B2 US 7463746B2 US 40340703 A US40340703 A US 40340703A US 7463746 B2 US7463746 B2 US 7463746B2
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US
United States
Prior art keywords
cover member
loudspeaker system
accordance
acoustic
boundary
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related, expires
Application number
US10/403,407
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English (en)
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US20050259841A1 (en
Inventor
Gerald F. Caron
George E. P. Chute
Allan S. Copeland
Eric J. Freeman
Doug Kramer
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Bose Corp
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Bose Corp
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Filing date
Publication date
Application filed by Bose Corp filed Critical Bose Corp
Priority to US10/403,407 priority Critical patent/US7463746B2/en
Assigned to BOSE CORPORATION reassignment BOSE CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: COPELAND, ALLAN S., FREEMAN, ERIC J., CHUTE, GEORGE E.P., KRAMER, DOUG, CARON, GERALD F.
Priority to EP04101207A priority patent/EP1465452A3/en
Priority to CNA2004100319884A priority patent/CN1551678A/zh
Priority to JP2004107240A priority patent/JP2004304810A/ja
Publication of US20050259841A1 publication Critical patent/US20050259841A1/en
Application granted granted Critical
Publication of US7463746B2 publication Critical patent/US7463746B2/en
Expired - Fee Related legal-status Critical Current
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00—Monitoring arrangements; Testing arrangements
    • H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • H04R1/345—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H04R1/023—Screens for loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/02—Details casings, cabinets or mounting therein for transducers covered by H04R1/02 but not provided for in any of its subgroups
    • H04R2201/021—Transducers or their casings adapted for mounting in or to a wall or ceiling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/13—Acoustic transducers and sound field adaptation in vehicles
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers

Definitions

  • the invention relates to wall mountable loudspeaker systems, and more particularly to high frequency loudspeaker systems having narrow openings through which acoustic energy can be radiated.
  • a loudspeaker system for mounting in a boundary of a listening space includes a first acoustic driver for radiating acoustic energy corresponding to audio signals.
  • the loudspeaker system is constructed and arranged to be mounted in a cavity in the boundary defined by an opening in the boundary.
  • the acoustic energy has a frequency response pattern.
  • a substantially planar, acoustically opaque cover member has edges and is positioned between the acoustic driver and the listening space.
  • the cover member is positioned so that the plane of the cover member is substantially parallel to the boundary.
  • the cover member defines a slot between the cover member and the boundary. The slot acoustically couples the acoustic driver and the listening space.
  • a loudspeaker system in another aspect of the invention, includes an acoustic driver for radiating high frequency acoustic energy, the acoustic energy having a frequency response pattern.
  • the loudspeaker system also includes an enclosure, for enclosing the acoustic driver.
  • the enclosure includes an opening acoustically coupling the acoustic driver and the listening space.
  • the opening has a length and a width, the width of less than one inch.
  • the opening acoustically couples the acoustic driver and a listening space.
  • the acoustic energy interacts with the boundary and the opening to modify the frequency response pattern of the acoustic energy to provide a modified frequency response pattern.
  • the loudspeaker system further includes an equalizer, for applying an equalization pattern to modify the audio signals so that the modified frequency response pattern matches a desired frequency response pattern.
  • FIGS. 1A-1C are a simplified side cross-sectional view, a simplified top plan vies, and a simplified front plan view, respectively, of a loudspeaker system according to the invention
  • FIGS. 2A-2E are side cross-sectional views of a loudspeaker system according to the invention.
  • FIGS. 3A-3D are simplified front plan views of alternate embodiments of a cover member of a loudspeaker system according to the invention.
  • FIG. 4 shows front plan views of alternate embodiments of the cover member of a loudspeaker system according to the invention
  • FIG. 5 is a side cross-sectional view of an additional optional feature of a cover member according to the invention.
  • FIG. 6 show side cross-sectional views of alternate embodiments of the invention.
  • FIGS. 7A-7B are views of a practical implementation of the invention.
  • FIG. 8 is a block diagram of an audio system employing the invention.
  • Loudspeaker system 10 includes an acoustic driver 12 mounted in an enclosure 14 .
  • Cover member 16 is mounted so as to form a narrow gap 18 or slot between cover member 16 and enclosure 14 through which acoustic energy from acoustic driver 12 can be radiated to a listening space.
  • On the cover member 16 there may be mounted an optional piezoelectric radiator 20 .
  • Enclosure 14 may include a flange portion 22 extending perpendicularly from an edge of enclosure 14 .
  • Cover member 16 may be mechanically coupled to enclosure 14 by fasteners (not shown), and spaced from enclosure 14 by standoffs (not shown) to define narrow gap 18 .
  • the listening space can be a room in a house, but is not restricted to rooms in houses; the listening area could be in a commercial building, outdoors, a cabin of an automobile, boat, airplane or some other vehicle, or some other listening area.
  • the invention will be described as it would be installed in a room.
  • Loudspeaker system 10 may be mounted in a cavity in a listening space boundary, such as a wall, ceiling, or floor of a room, or vehicle cabin so that enclosure 14 is in a cavity defined by an opening in the boundary surface and so that cover member 16 is substantially parallel to the boundary surface.
  • cover member has a larger cross sectional area than the hole in boundary defining the cavity into which enclosure 14 is mounted.
  • Cover member 16 is sufficiently close to the boundary so that cover member 16 obscures the enclosure 14 .
  • Flange portion 22 if present, can mate with the edges of a hole in a structural element, such as a section of wallboard 24 .
  • the enclosure 14 and the cover member 16 may be constructed and arranged so that narrow gap 18 may extend part of the way or all of the way around the perimeter of cover member 16 .
  • the narrow gap may be in the range of 0.3 inches (0.76 cm).
  • Acoustic driver 12 and piezoelectric radiator 20 can be conventional and communicatingly coupled to a source of audio signals, not shown.
  • Piezoelectric radiator 20 may excite part or all of cover member 16 so that cover member 16 becomes an active part of the loudspeaker system.
  • the characteristics and placement of the piezoelectric radiator may be based on acoustic considerations.
  • the material, size and geometry of enclosure 14 may be based on acoustic considerations.
  • Enclosure 14 may include a front volume 28 and rear volume 26 , which may be acoustically coupled by an optional port 52 .
  • Cover member 16 may be constructed of a material that is coverable by conventional wall covering, such as paint or wallpaper, or by a conventional floor or ceiling covering.
  • a loudspeaker system according to the embodiment of FIGS. 1A-1C is advantageous because it can be mounted in an interior room surface and can be covered with the same material as the surrounding surface.
  • the loudspeaker system can thereby be substantially imperceptible visually.
  • FIGS. 2A-2D there are shown some alternate embodiments of enclosure 14 .
  • rear volume 26 of FIGS. 1A-1C is absent.
  • front volume 28 of FIGS. 1A-1C is absent.
  • both rear volume 26 and front volume 28 are absent.
  • the interior of the wall acts as the enclosure 14 .
  • Acoustic driver 12 may be mounted in a baffle 21 that is mountable to a wall, or the acoustic driver 12 may be mounted directly to the wall.
  • the space in the wall acts as the rear volume 26 of other embodiments.
  • the sides of the enclosure 14 curve outwardly near the opening, eliminating a perpendicular corner present in the other embodiments.
  • Piezoelectric radiator 20 may also be present in these alternate embodiments, but is not shown in these views.
  • cover member 16 may be sealingly coupled to enclosure 14 and narrow gap 18 of FIGS. 1A-1C can be replaced by narrow front opening 30 in cover member 16 .
  • the narrow front opening 30 of FIGS. 3A and 3C are in the shape of elongated rectangles.
  • the narrow opening 30 in the surface of cover member 16 of FIG. 3B extends around the cover member 16 near the boundary.
  • the narrow opening may be of uniform or variable width, and the narrow opening can extend collinearly or non-collinearly, and may have a width of from about 0.3 inches (0.76 cm) to about one inch (2.54 cm).
  • the narrow opening does not need to be arranged so that the path from said the acoustic driver to the slot is perpendicular to the cover member.
  • a loudspeaker system in which the path from the acoustic driver to the narrow opening is non-perpendicular is advantageous, because it conceals the acoustic driver, and protects the acoustic driver from damage.
  • FIGS. 3A-3C also illustrate alternate configurations of acoustic driver 12 .
  • the acoustic driver 12 is positioned so that the center of a radiating surface of acoustic driver 12 faces the geometric center of the cover member.
  • the acoustic driver 12 is positioned so that the acoustic driver is positioned so that the center of a radiating surface of acoustic driver 12 does not face the geometric center of the cover member.
  • there is more than one acoustic driver and the radiating surfaces of the two acoustic drivers are positioned asymmetrically to the boundaries of the cover member.
  • the drivers may be identical, or may be different, as shown. There may be several acoustic drivers arranged to form a line array, with either an elongated cover member, or an elongated narrow front opening, as shown in FIG. 3D .
  • One or more piezoelectric radiators such as piezoelectric radiator 20 of FIGS. 1A-1C may also be present in these alternate embodiments, but is not shown in these views.
  • the narrow opening 30 may take on many forms and dimensions.
  • the narrow opening may be substantially linear with parallel sides, as in the embodiments of 3 A- 3 D, but may also be curved and the sides may be non-parallel. There may be more than one opening, and one or more of the openings may be discontinuous as in FIG. 3C .
  • Substantially linear narrow openings such as the opening of the embodiment of FIG. 3A , or of an embodiment according to FIGS. 1A-1C with the narrow opening on one edge only, can be advantageous as they are less subject to high frequency comb filtering.
  • the opening may also be in the sides, top, bottom, or in some combination of the top, sides, and bottom.
  • the shape may be non-rectangular, such as circular or elliptical, or may be irregular.
  • the shape of the cover member 16 and the placement of the acoustic driver 12 may be based on acoustic or cosmetic considerations.
  • regularly shaped (such as circular) cover members and placement of the acoustic driver so that the axis of the acoustic driver is perpendicular to the cover member and intersects the cover member at the geometric center generally results in on-axis “beaming” and a frequency response pattern that is more uniform at positions off axis from the loudspeaker system.
  • Piezoelectric radiator 20 may also be present in this alternate embodiment, but is not shown in this view. If the piezoelectric radiator is present, the shape of the cover member 16 also affects the frequency response pattern of the piezoelectric radiator.
  • cover member 16 there is shown a variation of cover member 16 .
  • the surface of the cover member 16 that faces the acoustic driver may have a protuberance 31 or a baffle system.
  • Protuberance 31 may extend from the interior surface of the cover member and may be shaped, dimensioned, and positioned, so that the surface of the protuberance acts as an element that reduces standing waves and other acoustic anomalies within enclosure 14 .
  • the surface of protuberances 31 may be substantially parallel to the radiating surface of the acoustic driver 12 or have some other shape that smoothes the frequency response pattern of the loudspeaker system.
  • the protuberance may act as an acoustic element (for example, a phase plug, a diffuser, a flow director, or an acoustic load modifier) that reduces standing waves and other acoustic anomalies within the enclosure 14 .
  • Piezoelectric radiator 20 of FIGS. 1A-1C may also be present in this embodiment, but is not shown in this view.
  • any of the loudspeaker systems of the previous figures can be configured so that the enclosures are conventional stand-alone enclosures instead of enclosures for in-wall or on-wall mounting.
  • the front surface of the loudspeaker system can be made completely or substantially free of undesirable grilles and can be finished so that the front surface of the loudspeaker system cabinet can be made to blend with the surroundings, or so that the front surface can be used, without affecting the acoustic properties of the loudspeaker system, as a mounting point for elements that enable the loudspeaker system to serve as a furniture accessory.
  • a loudspeaker system according to the invention can also be implemented in a portable device.
  • a loudspeaker system according to the invention can also be configured so that the cover member is the top or bottom of the loudspeaker system.
  • any of the embodiments of the previous figures can use elements of the walls, ceiling, or floor as one of the elements of the invention.
  • a wall cavity can be used as a rear volume or the cover member can be attached directly to the wall, ceiling, or floor.
  • FIG. 6 there are shown other embodiments of the invention.
  • the embodiment of FIG. 6 includes the elements of FIGS. 1A-1C .
  • Cover member 16 is configured so that a wall hanging 40 , such as a mounted painting, or ornamental element can be mechanically coupled to the cover member 16 to conceal cover member 16 .
  • the mechanical coupling can be accomplished by use of a fastener, such as a screw or bolt, by an adhesive, or by a picture hanging hook on the cover member with a wire or hanging bracket on the back of the wall hanging 40 .
  • the elements may be configured so that wall hanging 40 can be mechanically coupled directly to enclosure 14 , or so that the wall hanging can be mechanically coupled to and spaced from the wall.
  • the cover member is absent and appropriate standoffs and connectors are provided so the wall hanging 40 functions as the cover member.
  • FIGS. 7A-7B there are shown practical implementations of a loudspeaker system according to the invention. Reference numbers in FIGS. 7A-7B refer to implementations of the correspondingly numbered elements of the other figures.
  • FIG. 7A shows a partially simplified cross sectional, partially simplified top plan view of the loudspeaker system.
  • Acoustic drivers 12 A and 12 B are angled outwardly, so that at least one of the axes of motion 42 and 44 of the acoustic drivers intersects the cover member 16 at a non-perpendicular angle, for example about 25 degrees, and so that the distances (such as d1 and d2) from points on the radiating surface of said acoustic driver and equidistant from the axis to the cover member are different.
  • the implementations of FIGS. 7A-7B also include an acoustic port (not shown) that acoustically couples rear volume 26 and the listening space that increases the output of the loudspeaker system.
  • a loudspeaker system according to the invention may be equalized by the manufacturer with a fixed or variable equalization pattern. For simplicity and cost of equalizing circuitry, it is desirable that differences in frequency response be less than 10dB. Angling the acoustic drivers outward assists in keeping the differences in frequency response within the desirable range. Additional techniques that may assist in keeping the differences in frequency response within a desire range are shown in FIG. 7B .
  • the cover member 16 may be covered with damping material 46 , or the cover member can be constructed as a highly damped material, such as a “sandwich” of damping material 48 between two thin plastic or thin metal layers 50 .
  • the acoustic drivers may be placed so that one or both of the acoustic drivers are positioned closer to one side of the enclosure than to the other side.
  • Additional room-specific frequency response anomalies can be caused by the interaction of the narrow opening with the surrounding wall, with nearby objects, or with other room specific characteristics. This is particularly true with an embodiment such as FIG. 6 in which the composition and the dimensions of wall hanging 40 may not be known prior to installation (because the wall hanging is user selectable the dimensions of the wall hanging are not known when the loudspeaker is manufactured), or in an embodiment such as FIG. 2D , in which the dimensions and characteristics of the enclosure 14 are not known prior to installation, and may vary considerably from installation to installation and even from loudspeaker system to loudspeaker system in the same installation.
  • the frequency response pattern of the loudspeaker system according to the invention can be particularly improved by an adaptive equalizer.
  • Audio signal source 110 is coupled to audio signal processing circuitry 112 which may contain crossover circuit 124 . Audio signal processing circuitry 112 is in turn coupled to loudspeaker systems 11 and 10 - 1 - 10 - 5 . One or more of loudspeaker systems 10 - 1 - 10 - 5 may be a loudspeaker system in accordance with the loudspeaker systems of the previous figures.
  • Microphone device 116 is coupled to acoustic measuring circuitry 119 , which is in turn coupled to equalization calculation circuitry 118 and to memory 120 . Equalization calculation circuitry 118 may include microprocessor 126 , and may be coupled to audio signal processing circuitry 112 and may be coupled to an optional remote device 122 and to memory 120 .
  • Audio signal source 110 may be any of a variety of analog audio signal sources such as a radio, or, preferably, a digitally encoded audio signal source such as a CD player, a DVD or audio DVD player, or other source of digitally encoded audio signals, such as a “web radio” transmission or audio signals stored in digital form on a storage medium such as a compact disk, in random access memory, a computer hard disk or others.
  • Audio signal processing circuitry 112 may include conventional audio signal processing elements (which can include both digital and analog components and digital to analog converters, amplifiers and others) to process the encoded audio signals, which are then transduced into acoustic energy by loudspeaker systems 11 and 10 - 1 - 10 - 5 .
  • Audio signal processing circuitry 112 may also include circuitry to decode the audio signals into multiple channels and also may include circuit elements, such as low latency infinite impulse response filters (IIRs) that can modify the frequency response of the audio system by implementing an equalization pattern developed by equalization calculation circuitry 118 . Audio signal processing circuitry 112 may further include a crossover circuit 124 so that one of the loudspeaker systems, such as loudspeaker system 11 may be a subwoofer loudspeaker system, while the other loudspeaker systems may be high frequency loudspeaker systems.
  • IIRs infinite impulse response filters
  • loudspeaker systems 10 - 1 - 10 - 5 may be full range loudspeaker systems, eliminating the need for low frequency loudspeaker system 11 and crossover circuitry, or may include both low and high frequency acoustic drivers in which case the crossover circuitry may be in the loudspeaker systems 10 - 1 - 10 - 5 .
  • audio signal processing circuitry 112 and loudspeaker systems 10 - 1 - 10 - 5 may both include crossover circuitry that has more than one crossover frequency.
  • Microphone device 116 may be a conventional microphone.
  • Acoustic measuring circuitry may contain elements for receiving input from microphone 116 and measuring from the microphone input a frequency response pattern.
  • Equalization calculation circuitry 118 may include a microprocessor 126 and other digital signal processing elements to receive digitized signals from microphone device 116 and develop a frequency response pattern, compare the frequency response pattern with a desired frequency response pattern, and develop an equalization pattern that, combined with the frequency response pattern detected by microphone device 116 causes loudspeaker systems 11 and 10 - 1 - 10 - 5 to radiate a desired frequency response pattern.
  • the equalization pattern may be calculated by a software program running on a microprocessor 126 .
  • the software program may be stored in memory 120 , may be loaded from a compact disk playing on digital audio signal source 110 implemented as a CD player, or may be transmitted from a remote device 122 , which may be an internet link, a computer, a remote digital storage device, or another audio device.
  • the optional remote device 122 may be a computer running a software program and transmitting information to equalization calculation circuitry 118 .
  • Memory 120 may be conventional random access memory.
  • the audio system of FIG. 1 may be a component of a home theatre system that includes a video device such as a television or a projector and screen.
  • test audio noise or an audio waveform may be radiated responsive to an audio signal in a channel of audio signal source 110 ; alternatively, the source of the audio signal may be based on information stored in memory 120 or may be generated by computer instructions executed by microprocessor 126 .
  • Audio signal processing circuit 112 and loudspeaker systems 11 and 10 - 1 - 10 - 5 transduce the test audio signal to acoustic energy which is radiated into the room about which loudspeaker systems 11 and 10 - 1 - 10 - 5 are placed, creating a frequency response pattern from the interactions of the components of the loudspeaker systems and resulting from the interaction of the room with the loudspeaker systems.
  • Acoustic energy detected by microphone device 116 is transmitted in electrical form to acoustic measuring circuitry 119 .
  • Acoustic measuring circuitry 119 measures the frequency response pattern, and stores the frequency response pattern in memory 120 .
  • Equalization calculation circuitry 118 calculates the equalization pattern appropriate to achieve a desired frequency response pattern, and stores the calculated equalization pattern in memory 120 . Thereafter, when the audio signal processing circuitry 112 receives an audio signal from audio signal source 110 , the equalization pattern is transmitted from memory 120 to audio signal processing circuitry 112 , which applies the equalization pattern to the audio signals transmitted to loudspeaker systems 11 and 10 - 1 - 10 - 5 for transduction to acoustic energy.
  • audio signal processing circuitry 112 may contain some elements, such as digital signal processing chips, in common with equalization calculation circuitry 118 and acoustic measuring circuitry 119 .
  • portions of audio signal processing circuitry 112 , acoustic measuring circuitry 119 and equalization calculation circuitry 118 may be in a so-called “head unit” (that is, the device that contains signal sources, such as a tuner, or CD player, or connections to external signal sources, or both), and on which the controls, such as source selection and volume are located, and other portions may be in one of the loudspeaker systems 11 and 10 - 1 - 10 - 5 such as a subwoofer unit 11 , or distributed among the loudspeaker systems 11 and 10 - 1 - 10 - 5 .
  • head unit that is, the device that contains signal sources, such as a tuner, or CD player, or connections to external signal sources, or both
  • the controls such as source selection and volume are located
  • other portions may be in one of the loudspeaker systems 11
  • This implementation facilitates a head unit that can be used with a variety of loudspeaker systems, while the portions of the audio signal processing circuitry 112 and equalization calculation circuitry 118 that are specific to the loudspeaker system are in one of the loudspeaker systems.
  • FIG. 8 describes a specific adaptive equalizer, described in more detail in U.S. pat. app. Ser. No. 10/105,206, filed Mar. 25, 2002, and attached as Appendix A. However, a wide range of adaptive equalizers can be used.
  • An audio system in accordance with the audio system of FIG. 8 is advantageous because a desired frequency response pattern can be produced from loudspeaker systems that may otherwise have anomalous frequency response patterns due to the configuration of the speaker and the interaction with the wall and nearby objects.
  • the system is especially useful with loudspeaker systems such as the loudspeaker system of FIG. 6 , because the wall hanging is effectively a part of the loudspeaker system. Because the dimensions, shape, and other physical and acoustic properties are not known before installation, an equalization performed before installation may not result in the desired frequency response pattern.
  • An audio system according to FIG. 8 can be equalized by the consumer in a manner that corrects for frequency response pattern anomalies resulting from the characteristics of the loudspeaker system themselves and frequency response pattern anomalies resulting from the interaction of the loudspeaker systems with the specific room in which they are placed.

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  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • General Health & Medical Sciences (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
US10/403,407 2003-03-31 2003-03-31 Narrow opening electroacoustical transducing Expired - Fee Related US7463746B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US10/403,407 US7463746B2 (en) 2003-03-31 2003-03-31 Narrow opening electroacoustical transducing
EP04101207A EP1465452A3 (en) 2003-03-31 2004-03-24 Narrow opening electroacoustical transducing
CNA2004100319884A CN1551678A (zh) 2003-03-31 2004-03-31 窄开口电声转换器
JP2004107240A JP2004304810A (ja) 2003-03-31 2004-03-31 幅狭開口による電気音響的変換

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Application Number Priority Date Filing Date Title
US10/403,407 US7463746B2 (en) 2003-03-31 2003-03-31 Narrow opening electroacoustical transducing

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US7463746B2 true US7463746B2 (en) 2008-12-09

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EP (1) EP1465452A3 (ja)
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US20100172530A1 (en) * 2009-01-07 2010-07-08 Palm, Inc. Speaker component for a portable electronic device
US20100212996A1 (en) * 2007-10-02 2010-08-26 M.I. Laboratories Corporation Speaker system
US20100316245A1 (en) * 2009-06-12 2010-12-16 Rajeev Mishra Sound Enhancement System
US20110243362A1 (en) * 2010-03-31 2011-10-06 Chick Geoffrey C Acoustic radiation pattern adjusting
US8430201B1 (en) * 2010-09-09 2013-04-30 Michael Weidner Speaker enclosure
US9363589B2 (en) * 2014-07-31 2016-06-07 Apple Inc. Liquid resistant acoustic device
US9609405B2 (en) 2013-03-13 2017-03-28 Thx Ltd. Slim profile loudspeaker
US9799321B2 (en) * 2015-12-09 2017-10-24 Jl Audio, Inc. Waveguide for a boat
US9848259B2 (en) * 2015-08-18 2017-12-19 Samsung Electronics Co., Ltd. Loudspeaker

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JP2006311076A (ja) * 2005-04-27 2006-11-09 Toyota Auto Body Co Ltd 車載スピーカの取付構造
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CN1551678A (zh) 2004-12-01
US20050259841A1 (en) 2005-11-24

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